¿Qué es la configuración en Web xml?

What is configuration in Web xml?

web. xml defines mappings between URL paths and the servlets that handle requests with those paths. The web server uses this configuration to identify the servlet to handle a given request and call the class method that corresponds to the request method (e.g. the doGet() method for HTTP GET requests).

Configuring a Filter

1. Open the web. xml deployment descriptor in a text editor or use the Administration Console.
2. Add a filter declaration.
3. Specify one or more initialization attributes inside a element.
4. Add filter mappings.
5. To create a chain of filters, specify multiple filter mappings.

All you need to do is to declare the ContextLoaderListener in your web. xml and use a contextConfigLocation to set which context files to load. You can then use the WebApplicationContext to get a handle on your beans. or can do both together.

ServletConfig Interface with example. Servlet Container creates ServletConfig object for each Servlet during initialization, to pass information to the Servlet. This object can be used to get configuration information such as parameter name and values from deployment descriptor file(web. xml).

Filters in web. xml are used for filtering functionality of the Java web application. They manipulate the responses from the server and sent to the client.

2 Answers. It allows you to declare servlet filters, which are aspects for HTTP requests. A filter chain can intercept an incoming request and/or an outgoing response and modify it as needed. A common example is to have a filter that performs a GZIP compression on a response stream if the user’s browser can accept it.

The context path of a web application defines the URL that end users will access the application from. A simple context path like myapp means the web app can be accessed from a URL like http://localhost:8080/myapp.

web. xml defines mappings between URL paths and the servlets that handle requests with those paths. The web server uses this configuration to identify the servlet to handle a given request and call the class method that corresponds to the request method.

xml file is the deployment descriptor for a Servlet-based Java web application (which most Java web apps are). Among other things, it declares which Servlets exist and which URLs they handle. The part you cite defines a Servlet Filter. Servlet filters can do all kinds of preprocessing on requests.

Servlets JEE 6 shipped with Servlet 3.0 which enables us to use annotations for servlet definitions, minimizing the use of a web.xml file for a web application. For example, we can define a servlet and expose it with the @WebServlet annotation

As always, the source code for this tutorial can be found on GitHub. Additionally, an application using the traditional web.xml file can also be found on GitHub. For a Spring-based approach, head over to our tutorial web.xml vs. Initializer with Spring.

The init parameters of a servlet can only be accessed by that servlet. Here is how you configure them in the web.xml file: Here is how you read the init parameters from inside your servlet – in the servlets init() method: A servlets init() method is called when the servlet container loads the servlet for the first time.

The web.xml Deployment Descriptor Elements in Oracle’s BEA WebLogic Server 8.1 Documentation pretty much sums up each element in a web.xml file. But I am also curious about points below: